Dell Inspiron 13 7000 Series 2-in-1(7348, Early 2015) - Manual (Page 28)

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Keyboard
]The backlit keyboard on Dell laptops have different lighting states. Press the
<Fn> and the right-arrow key to toggle between the various lighting states.
NOTE: Backlit keyboard may not be available on all computers. To check
if backlit keyboard is available on your computer, see the Specifications
of your computer at dell.com/support.
On‑Screen Keyboard
On-screen keyboards are available on almost all computers and tablets,
however, they are generally used in touchscreen devices such as tablets and
all-in-one computers. You can select the keys using a mouse or by touching
the keys on a touchscreen.
Keyboard Connection Types
Keyboards can be connected to your computer with a cable (wired) or using
wireless signals (wireless).
Wired
Wired keyboards are connected to the computer using a cable (generally
USB) and do not require additional power source, such as batteries.
Wireless
Wireless keyboards use Radio Frequency (RF) or Bluetooth (BT) to connect
to your computer. This reduces cable clutter and gives you the flexibility to
use the keyboard from a more comfortable position within a few meters
from the computer. Such keyboards require batteries to operate.
Keyboard that use RF technology usually ship with a receiver that you
must connect to your computer. Bluetooth keyboards can pair with your
computer’s built-in Bluetooth card or an external Bluetooth adapter.